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A novel framework for estimating the Bowen ratio over small water bodies

Citation Link: https://doi.org/10.15480/882.14598
Publikationstyp
Journal Article
Date Issued
2025-02-02
Sprache
English
Author(s)
Rezazadeh, Amir  
Akbarzadeh, Pooria  
ShahMardan, Mohammad Mohsen  
Aminzadeh, Milad  
Geo-Hydroinformatics B-9  
TORE-DOI
10.15480/882.14598
TORE-URI
https://hdl.handle.net/11420/54221
Journal
Hydrological processes  
Volume
39
Issue
2
Article Number
e70055
Citation
Hydrological Processes 39 (2): e70055 (2025)
Publisher DOI
10.1002/hyp.70055
Scopus ID
2-s2.0-85216544647
The Bowen ratio, defined as the ratio of sensible to latent heat flux, is crucial for quantifying land-atmosphere energy exchanges and evaporation rates from terrestrial surfaces. Despite extensive research on the Bowen ratio over placid water surfaces (e.g., lakes), further investigation is needed to understand its dynamics in small reservoirs subjected to water inflow/outflow (i.e., surface flows) and wind. To address this knowledge gap, the evaporation rate and the sensible heat exchanges are measured between the water surface and overlying air in a small laboratory basin under different water surface flow rates (1.0–10.5 l min−1) and wind speeds (0–2.0 m s−1). Three different wind flow conditions are explored: no wind, headwind (opposing the water surface flow), and tailwind (aligning with water surface flow). The findings indicate strong correlations between sensible heat flux, water surface flow rate, and wind speed, particularly under headwind conditions. Nevertheless, concerning the latent heat flux, the measurements demonstrate that for each wind condition, the evaporation reaches its minimum value in a certain water surface flow rate, resulting in the highest value of the Bowen ratio. To facilitate the application of these laboratory findings for estimating the Bowen ratio under real environmental conditions, mathematical relationships using dimensionless numbers obtained through non-linear regression analysis are established. The results exhibit a good agreement with measurements in a small water basin.
Subjects
Bowen ratio | latent heat flux | sensible heat flux | water reservoirs | water surface flow
DDC Class
551: Geology, Hydrology Meteorology
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
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